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 Post subject: welded tubular steel
PostPosted: Thu Nov 24, 2016 6:50 pm 
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Hi there

I'm a cabinet maker and I'm making a spiral staircase. The centre pole of the staircase will be made of steel and have brackets bolted onto it, not welded.

The dimension of the pole I'm planning on using is a Tata steel 193.7mm wide with a 12.5mm thick wall, approx 6m in height.

I rang up to get a price for the seamless steel pole today and it about £600 plus vat. Then the lady i spoke to said that they could supply a welded steel pole, exactly the same dimensions for about half the price.

I work n timber mostly and have never heard of a welded steel tube so I'm interested to know if its as strong as a seamless tube, and do people think it would be suitable for the centre of a spiral staircase?

Thanks very much, Paul


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 Post subject: Re: welded tubular steel
PostPosted: Thu Nov 24, 2016 7:56 pm 
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From my knowledge welded seam tube is equally as good as seamless tube these days. The modern machine welding techniques used gives a very high performance tube which I think would be certainly strong enough for your project. I think the main issue you will have is flex as 6 meters is quite a length.

Hopefully Hitch, who is a regular on this forum, will pick this up and he will be able to give you a definitive answer on this as he is a steel fabricator. :thumbright:

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 Post subject: Re: welded tubular steel
PostPosted: Thu Nov 24, 2016 8:15 pm 
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welded steel tube is the most common, cds (cold drawn seemless) is used for strength, used in roll cages, high end custom bike frames, gun barrels and high pressure pipe work tbh something like this need to be designed and the loading calculated especially as your drilling and tapping it and weakening the tube or you go the kit route and make the treads (internal) to suit

be aware it needs to meet building regs, at 6m that's going to be a fire issue too if its spanning floors

imo leave the metal work to the people that do them every day

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 Post subject: Re: welded tubular steel
PostPosted: Thu Nov 24, 2016 11:34 pm 
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CHS will be what you'll need i'd expect...Circular hollow section. The grade though, s275 or s355 will be specd by the engineer doing your calcs..

CHS has a seam along its length but can be either hot formed of cold formed.

CDS, is seamless and cold formed.

Get it drawn up and get a local fabrication firm to sort the steelwork out. There must be a base plate and cap to weld on at least?

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 Post subject: Re: welded tubular steel
PostPosted: Fri Nov 25, 2016 7:58 pm 
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Thanks for all the advice.


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